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| <h2 title="Class CompressedMatrixBlockFactory" class="title">Class CompressedMatrixBlockFactory</h2> |
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| <pre>public class <span class="typeNameLabel">CompressedMatrixBlockFactory</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Factory pattern to construct a CompressedMatrixBlock.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/compress/CompressedMatrixBlockFactory.html#compress-org.apache.sysds.runtime.matrix.data.MatrixBlock-">compress</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb)</code> </td> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/compress/CompressedMatrixBlockFactory.html#compress-org.apache.sysds.runtime.matrix.data.MatrixBlock-org.apache.sysds.runtime.compress.CompressionSettings-">compress</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| <a href="../../../../../org/apache/sysds/runtime/compress/CompressionSettings.html" title="class in org.apache.sysds.runtime.compress">CompressionSettings</a> customSettings)</code> </td> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/compress/CompressedMatrixBlockFactory.html#compress-org.apache.sysds.runtime.matrix.data.MatrixBlock-int-">compress</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| int k)</code> </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/compress/CompressedMatrixBlockFactory.html#compress-org.apache.sysds.runtime.matrix.data.MatrixBlock-int-org.apache.sysds.runtime.compress.CompressionSettings-">compress</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| int k, |
| <a href="../../../../../org/apache/sysds/runtime/compress/CompressionSettings.html" title="class in org.apache.sysds.runtime.compress">CompressionSettings</a> compSettings)</code> |
| <div class="block">The main method for compressing the input matrix.</div> |
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| <h4>CompressedMatrixBlockFactory</h4> |
| <pre>public CompressedMatrixBlockFactory()</pre> |
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| <h4>compress</h4> |
| <pre>public static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> compress(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb)</pre> |
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| <h4>compress</h4> |
| <pre>public static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> compress(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| <a href="../../../../../org/apache/sysds/runtime/compress/CompressionSettings.html" title="class in org.apache.sysds.runtime.compress">CompressionSettings</a> customSettings)</pre> |
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| <pre>public static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> compress(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| int k)</pre> |
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| <h4>compress</h4> |
| <pre>public static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> compress(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a> mb, |
| int k, |
| <a href="../../../../../org/apache/sysds/runtime/compress/CompressionSettings.html" title="class in org.apache.sysds.runtime.compress">CompressionSettings</a> compSettings)</pre> |
| <div class="block">The main method for compressing the input matrix. |
| |
| SAMPLE-BASED DECISIONS: Decisions such as testing if a column is amenable to bitmap compression or evaluating |
| co-coding potentials are made based on a subset of the rows. For large data sets, sampling might take a |
| significant amount of time. So, we generate only one sample and use it for the entire compression process. |
| |
| Once the compression plan is selected based on sampling, the plan is verified and decisions are overwritten by |
| full estimates.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>mb</code> - The matrix block to compress</dd> |
| <dd><code>k</code> - The number of threads used to execute the compression</dd> |
| <dd><code>compSettings</code> - The Compression settings used</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A compressed matrix block.</dd> |
| </dl> |
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